基于静态故障树的矿井提升机故障检测研究

矿井提升机在矿井生产中起着重要作用,但在运行过程中易发生各种故障,严重干扰了矿井的正常生产。为此,采取静态故障树分析法来分析提升机故障,实现快速检测故障,确定故障位置。本文以我国某矿提升机为例,介绍了矿井提升机中常见的故障类型及静态故障树分析方法,并通过静态故障树分析法分析了提升机过卷故障,再通过定性和定量分析确定底事件对顶事件的影响大小,以快速确定故障。     

机电一体化系统中的可靠性分析

对机电一体化系统的可靠性从硬件故障和软件故)障两方面进行了分析,提出了相应的诊断方法和维修方法。以系统的结构和故障信号综合为依据,对各类故障进行综合与分析,从而将机电一体化控制系统的故障分为硬件逻辑故障、软件故障和瞬态干扰故障等几大类型。     

基于DSP的煤矿电缆故障测距系统

考虑到煤矿对供电性能的特殊要求,以提高故障定位的速动性和准确性为目标,设计了一个煤矿电缆短路故障测距系统。测距系统以数字信号处理器TMS320F2812为核心控制器,运用小波变换和奇异性检测理论作为故障信号处理技术,可以实现快速、准确的煤矿电缆短路故障定位。仿真实验结果表明系统具有优良的故障测距性能。     

矿用轴流式通风机轴承故障识别及处理

以矿用轴流式通风机轴承为研究对象 ,探讨轴承故障特征并分析造成该故障的原因 ,提出了解决此类故障的处理办法 ,为通风机轴承故障识别和处理提供可行的实践依据     

铲运机维修实例

铲运机是井下装运工序的主要设备。本文以使用的WJD-0.75型电动铲运机为例,列举了出现的典型故障,分析了故障产生的原因,提出了故障排除方法,总结了故障处理经验及教训。     

配网单相接地故障自动定位软件设计与开发

针对目前单相接地故障自动定位技术存在的不足,基于信号注入的基本原理,以单相接地故障自动选线和定位单元为基础,设计并开发了单相接地故障自动定位软件系统,该系统以VS.NET为开发平台、基于SQL数据库的数据共享编程和面向对象的C#开发语言实现.在煤矿供电系统发生单相接地故障后,通过获取选线结果和分散安装的故障定位单元的判断结果,能够自动判断出故障所在区段,有助于快速、准确排除故障,恢复煤矿系统供电.     

基于不确定理论的复杂机械系统的故障预测

针对机械系统信号的不确定性,提出了一种以贝叶斯网络为依据建立故障预测模型的方法,将该方法应用于机械系统的故障预测,针对不同的故障样本进行实验研究,结果表明该方法具有较高的预测精度,为复杂系统的故障预测提供了新途径。     

矿井提升机变量泵液压站故障分析

通过对现场使用提升机TE151和TE161液压站的常见故障进行分析,介绍了该系列液压站常见故障,针对故障的具体表现,进行了相对应的原因分析。对故障部位的故障现象作以介绍,产生故障的原因作出分析。并且提出了检修方法和整改的措施。     

小电流接地系统中单相接地故障的判断及处理

介绍了小电流接地系统中发生单相接地故障时,如何判断接地故障和区分接地故障相,快速寻找接地故障点,以达到及时排除隐患,保证电力系统安全生产的目的.     

以“动态”观点分析判断排除设备故障

主要介绍了“动态”观点分析判断设备故障的简单方法,并且通过2个现场的维修实例来加以说明,如何引导维修人员以“动态”观点分析、判断和排除设备故障,将设备故障以最短的时间内排除,值得借鉴。     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。